Help with smock stitch

Iam making Vickie Howell baby sundress with smocking stitch. I go in between 6/7stitch make a loop knit this with first stitch etc…do pattern and end up with 2 extra stitches. any help out there am I doing something wrong?:knitting:

Please post the st pattern for the sundress, or a link, so we have more to go on.